HP ProCurve Secure 7000dl Series Basic Management And Configuration Manual page 612

Dynamic Host Configuration Protocol (DHCP)
Managing and Troubleshooting the DHCP Client
C a u t i o n
13-28
Debug messages can tie up the router's processor and compromise the net-
work's functions. Therefore, you should take care when using them with active
networks.
Before you run debug messages, you should verify that the interface is up and
double-check your client ID.
Scan the debug messages. The interface should produce debug messages such
as those shown in Figure 13-7:
ProCurve# debug ip dhcp-client
2005.07.08 19:15:23 DHCP.CLIENT Loading timer 1 with 1 seconds
2005.07.08 19:15:23 DHCP.CLIENT Loading timer 2 with 3
2005.07.08 19:15:24 DHCP.CLIENT Timer 1 Expired
2005.07.08 19:15:24 DHCP.CLIENT Sending Discover Message: Xid =
34681764
2005.07.08 19:15:24 DHCP.CLIENT Loading timer 1 with 3 seconds
2005.07.08 19:15:24 DHCP.CLIENT Current State = Selecting
2005.07.08 19:15:25 DHCP.CLIENT Processing Offer Message: Xid =
34681764
2005.07.08 19:15:25 DHCP.CLIENT Sending Request Message: Xid = 34681764
2005.07.08 19:15:25 DHCP.CLIENT Loading timer 1 with 2 seconds
2005.07.08 19:15:25 DHCP.CLIENT Current State = Requesting
2005.07.08 19:15:25 DHCP.CLIENT Processing Ack Message: Xid = 34681764
2005.07.08 19:15:25 DHCP.CLIENT Loading timer 1 with 43200 seconds
2005.07.08 19:15:25 DHCP.CLIENT Loading timer 2 with 64800 seconds
2005.07.08 19:15:25 DHCP.CLIENT Current State = Bound
Figure 13-7. An Interface Successfully Receiving a Dynamic Address
When the DHCP client's state is "Bound," the interface has received the
address. The client sets two timers, which expire before the lease does. When
these timers expire, the client requests to keep its address.
Usually, problems with the DHCP client occur after sending a Discover
message. The server does not return an Offer message, and so the interface
continues sending out Discover message after Discover message. The state
toggles between "Selecting" and "Init."
Causes for this condition include:
the interface is down
the interface's client identifier does not match that expected by the DHCP
server
the server has no available addresses